A blog post by IHS has pointed out that the new Apple Watch with integrated LTE connectivity, while clever in including the needed antenna within a slim form factor, may struggle in some areas as it supports a smaller selection of mobile network bands, or frequencies, than modern smartphones as well as having a small antenna.
With AT&T or T-Mobile, the Apple Watch Series 3 uses either LTE or 3G for connectivity. However, the Series 3 does not support the 3G technology of either Sprint or Verizon. Instead, the watch will only connect to LTE to make Voice over LTE (VoLTE) calls or send texts with Sprint or Verizon.
Of course, if the user also has an iPhone, that can be used to connect, but then if you are always near your iPhone, you don’t really need the connectivity!
